UUID tool class

There is a UUID class in java.util, which is often used to generate irregular and unique serial numbers such as IDs or activation codes.

write a method to test

public static void main(String[] args) {
		String uuid = UUID.randomUUID().toString();
		System.out.println(uuid);
	}

The result generated is: ae3c33ad-1f28-4a93-9320-c912f46171fc

length 36

In view of the fact that we generally use it as an ID, there is no middle "-", so we remove the middle "-"

public static void main(String[] args) {
//		String uuid = UUID.randomUUID().toString();
		String uuid = UUID.randomUUID().toString().replace("-", "");
		System.out.println(uuid);
	}

The generated result is: 952d2bbafb9e408e8ffd13085150284a

length 32

Further encapsulated into UUID tool class UUIDUtil

public class UUIdUtil {
	public static String getUUID(){
        return UUID.randomUUID().toString().replace("-", "");
   }

   public static void main(String[] args) {
       System.out.println("UUID before format: " + UUID.randomUUID().toString());
       System.out.println("Formatted UUID: " + getUUID());
   }
}

What is finally generated is a hexadecimal unordered unique character sequence of length 32.